OK this will take a while to explain
and aparently your mugen knowledge is less than basic, so I'll try to explain from the begining
the definition and core of your lifebar is called "Fight.def" located in your data folder
an example of the files fight.def uses is:
sff = fight.sff
snd = fight.snd
font1 = jg.fnt
font2 = num1.fnt
font3 = name1.fnt
fightfx.sff = fightfx.sff
fightfx.air = fightfx.air
common.snd = common.snd
note the font number 3. That "name1.fnt" is the font used by the lifebar to display names
if you want for example to change that font for a custom one called "customname.fnt"
font3 = name1.fnt
font3 = customname.fnt
granted that "custom.fnt" file is located in the font folder
so, what you need to do is open your fight.def and locate the font used for names (the "lifebar name font" by krizalid99v2) and change it for the custom one with the logos in it(comic book font).
if you did all correctly now when you open mugen and you try to engage in combat right now you'll see a bunch of hero logos instead of the proper name of your character.
to fix this open your chars folder and locate the folder of Black Cat and open her definition file (the one that end in .def)
you'll see something like this (this is kung fu man, black cat shouldn't look different)
name = "Kung Fu Man" ;Name of character
displayname = "Kung Fu Man" ;Name of character to display
versiondate = 09,30,2009 ;Version date of character (MM-DD-YYYY or X.XX)
mugenversion = 1.0 ;Version of M.U.G.E.N character works on (X.XX)
author = "Elecbyte" ;Character author name
note "name" and "displayname"
name is what mugen uses to identify the character mostly used to perform special intros against other characters
displayname is only used to display its name in the lifebars
you'll want to change "displayname" to make you're char compatible with the custom comic book font (yes I said you're)
to make black cat compatible change:
displayname = "Black Cat"
displayname = "A"
black cat can only be called "A" (note capitals) to display her logo properly
spiderman can only be called "B"
hulk as well can only be called "C"
the same for the other heroes....
hope you at least got the idea of what I was trying to explain.